Question

How do organisms like ameoba obtain their nutrition ? What is its mode of nutrition ? Explain with the diagram.

Answer 1

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How do organisms like amoeba obtain their nutrition? What is the mode of nutrition? Explain with the diagram.

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Mode of nutrition in amoeba : heterotrophic ( holozoic)

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The process of feeding amoeba is known as Phagocytosis.

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Explanation of phagocytosis

Amoeba takes in food using temporary finger like extensions of cell surface which fuse over the food particle forming a food vacuole. Inside the food vacuole, complex substances are broken down into simpler ones which then diffuse into the cyroplasm. The remaining undigested material is moved to the surface of the cell and thrown out.

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The process of phagocytosis is explained by the figures in the attachments showing

• ingestion
• digestion
• absorption
• assimilation
• egestion

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Answer 2

Answer:

Holozoic nutrition is the process of nutrition that takes place in organisms which take solid or liquid food inside their body. Amoeba follows holozoic nutrition.

Holozoic nutrition in amoeba takes place in the following steps:

1)Ingestion

Ingestion is the process of taking in the food into the body either by swallowing or absorbing it. Amoeba pushes out the pseudopodia to encircle the food and engulfs it forming a food vacuole. This process is known as phagocytosis.

2)Digestion

Digestion is the process of breaking the insoluble and large food molecules into soluble and minute molecules. In amoeba, the food vacuoles are transported deeper into the cell and with the help of the digestive enzymes, the large insoluble particles are broken down to the simpler molecules.

3)Absorption

In this process of absorption, the nutrients from the digested food material are absorbed into the cell’s cytoplasm by leaving behind the undigested particles. This process is called diffusion. The excess food is stored in the form of glycogen and lipids.

4)Assimilation

Assimilation is the process of obtaining energy from the absorbed food molecules. In amoeba, absorbed food molecules are utilized for producing the energy required to carry out different life processes within the cell.

5)Egestion

Egestion is the process of excretion of undigested food material. In amoeba, this process is carried out by rupturing the cell membrane to remove the undigested food material from its body.

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